New! - Search other data sources for Panicum umbonulatum

Help - Wrong Description?

Kew Data Sources

Kew's Herbarium Catalogue
ePIC - Electronic Plant Information Centre

External Data Sources

Note - this takes you off of our website
Use your browser's back button to return to this page

GrassBase - The Online World Grass Flora

Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Panicum umbonulatum

HABIT Perennial. Culms decumbent, or rambling; 40–100 cm long; rooting from lower nodes. Culm-internodes terete; distally pubescent. Culm-nodes constricted; purple; pubescent. Leaf-sheaths pilose; with simple hairs; outer margin hairy. Ligule a ciliate membrane; 0.6–1 mm long. Collar pubescent. Leaf-blade base broadly rounded, or cordate. Leaf-blades lanceolate; 5–12 cm long; 4–14 mm wide. Leaf-blade surface glabrous, or pubescent; hairy adaxially. Leaf-blade margins ciliate; hairy at base. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle. Peduncle 20 cm long; pubescent above.

Panicle open; ovate; effuse; 4–12 cm long; 3.5–10 cm wide. Panicle axis pubescent. Panicle branches scabrous; pubescent in axils.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels pubescent.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets elliptic; dorsally compressed; plano-convex; 2.4–2.8 mm long; 1–1.1 mm wide; falling entire.

GLUMES Glumes dissimilar; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; not clasping; 1.2–1.4 mm long; 0.33–0.5 length of spikelet; membranous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex truncate. Upper glume elliptic; 1 length of spikelet; membranous; without keels; 7–9 -veined. Upper glume surface glabrous, or puberulous. Upper glume apex acute.

FLORETS Basal sterile florets barren; with palea. Lemma of lower sterile floret similar to upper glume; elliptic; 1 length of spikelet; membranous; 7 -veined; glabrous, or puberulous; acute. Palea of lower sterile floret 1.5 mm long. Fertile lemma elliptic; dorsally compressed; 2.4–2.5 mm long; 0.9–1.1 mm wide; indurate; pallid; shiny; without keel. Lemma surface papillose. Lemma margins involute. Lemma apex apiculate; with a little green crest and pubescent. Palea involute; indurate.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 1.6 mm long. Embryo 0.5 length of caryopsis. Hilum punctiform.

DISTRIBUTION South America: Mesoamericana.

NOTES Paniceae. Zuloaga 1994.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.